Author
Topic: Jerky acceleration (Read 5065 times)

In the morning when i drive to work it accelerates as it should with no issues.

When i am leaving work it starts to accelerate erratically. As i drive away it acts like i am punching the gas pedal and letting off. The effect is so much that people have looked and likely wondered why i was driving that way. It seems to go away after about 3 to 4th gear. One day it did this issue slightly all the way home in all gears.

During this my foot is on the gas pedal and all else seems normal.

The car is a 2011 manual diesel with 150,000 km. I just took the car to get a fuel line cleaning and the fuel filter change thinking it could be that but its not helping.

I have connected a WOW odb computer and all systems from car pc are green with no failures.

If you have data record in the obd reader it might be good to record rail fuel pressure and throttle position and see how they behave when accelerating. There have been few times when people had got cracks in the fuel filter heater element. It has sucked air in causing drop n the fuel pressure.

I had issues with 3rd party filter. It was not flowing correctly and caused limp mode due low fuel pressure. Fixed it with OEM filter.

I tested the egr valve with a voltometer and found that it had a voltage rating that was low compared to what it should have been. I replaced it and now the car doesnt do the hestitation or hiccups anymore!

I tested the egr valve with a voltometer and found that it had a voltage rating that was low compared to what it should have been. I replaced it and now the car doesnt do the hestitation or hiccups anymore!

I tested the egr valve with a voltometer and found that it had a voltage rating that was low compared to what it should have been. I replaced it and now the car doesnt do the hestitation or hiccups anymore!

Hope this helps those who also experience this issue.

Cheers

Excellent. Thanks heaps for getting back to us with an update.

The surging symptoms and evidence of bug did not lead me to think of EGR. Although, Im reasonably sure the fuel blockage did contribute.

I see this as another really valuable piece of information contributed by ( as usual) an i30 OWNER.

I tested the egr valve with a voltometer and found that it had a voltage rating that was low compared to what it should have been. I replaced it and now the car doesnt do the hestitation or hiccups anymore!

Hope this helps those who also experience this issue.

Cheers

This seems to be a reasonably common issue with the sister model, the KIA Ceed.

I get the same symptoms starts and runs fine but if I do multiple starts that's when you get that "kangarooing".

Flooring the car solves the problem but cleaning/replacing the EGR valve seems to be the solution.

Hi everybody,I have just bought a 2 year used i30 PDu ... and have the hesitation syndrome 1200-1250rpms precisely (not kangaroo, just hesitation in that range)It is more evident with increasing load or on steep hills but once over that rev range it is ok

Hi everybody,I have just bought a 2 year used i30 PDu ... and have the hesitation syndrome 1200-1250rpms precisely (not kangaroo, just hesitation in that range)It is more evident with increasing load or on steep hills but once over that rev range it is ok

The car only has 2000Km on the clock

Only done 1000km per year. EGR problems are usually due to carbon/tar build up. If it is not en electronic failure, the EGR will be ok ( clean).

Sounds like the car needs an Italian style freeway drive . Try Milan to Naples, then report back

Hi, I have similar hesitating problem with my 200 000 kms 2011 y - 1.6 crdi... During winter when motor starts at 1000RPM and above everything is fine, but when RPMs drop to point like 750-800 hesitation at accelerating and hiccups occur , mostly at 1 and 2 gear . Now when weather temperature rises the car starts close to 800 RPMs and driving gets dangerous at traffic lights, might hit someone if too close. Not sure if problem is temp related or RPMs related? Any idea what could be the reason? Forgot to say .. computer diagnostics at HYUNDAI Dealer said ALL IS FINE.